Automatic brake for talking-machines



H. THORENS.

AUTOMATIC BRAKE FOR TALKING MACHINES.

APPLICATKON FILED APR. 25. 1917.

1,381,032,, Patented June 7, 1921.

Fig. 4

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HERMAN 'N THORENS, OF SAINTE-CROIX, SWITZERLAND.

AUTOMATIC BRAKE FOR TALKING-MACHINES.

Application filed April 25, 1917. Serial No. 164,334. I

To all whom it may concern Be it known that I, HERMANN THoRnNs,

a citizen of the Swiss Republic, resident of Sainte-Croix, Switzerland, have invented a new and useful Automatic Brake for Talking-Machines; and I do hereby declare the following to be a full, clear, and exact description of the same.

This invention relates to automatic brakes for talking machines of the type which comprise a two armed lever under spring tension one end of the lever being provided with a brake pad and the other engaging with the tone arm in such manner that during the playing of a piece the brake pad is held inoperative but upon the completion of the piece and the needle being free of the groove, the arm under spring tension causes the needle end of the tone arm to travel toward the center of the record and is thus chine.

The object of this invention is to provide a brake of this type which can be adjusted so that it may be used with machines having different sized boxes.

The accompanying drawing illustrates by way of example one embodiment of my invention, the same being a plan view of a talking machine provided with my automatic brake.

The box of the talking machineis shown in a and bears, on the one side, the plate 72 carrying the disk 6 turning around the axis 0 and, on the other side, pivoting around the vertical axis 6, the tone arm (Z, the end of which is provided with a diaphragm with its needle. (Not shown.)

On the tone arm 61 is fastened a curved stem f having a portion thereof concentric with the axis of rotation of the tone arm. Opposite said stem is a roller 9, connected with a bent lever composed of two parts h and [L and pivoted on the axis k fastened on to the box of the talking machine. The parts. 72, and h of the said lever are both connected with a screw 2' which may be placed in various holes 2' 1, i bored into the piece 7L1, thus allowing the bent lever to be lengthened or shortened in accordance with the size of the box on which the brake is to be fitted. The other end of the bent lever is provided with a brake-pad constituted, for instance, by a piece of leather.

A spring is constantly draws the bent part of the lever bearing the roller 9, thus causing said part of lever to bear against the name to this specification in Specification of Letters Patent. P t ted J ne 7, 1921 stem f fastened on to the tone'arm d, hence the brake-pad j a ainst the eri her of the plate I). o r p p The working of the various members as substantially set forth in the foregoing examples, is easy to understand.

While the reproductionof apiece of music 7 is proceeded with, the end of the tone arm carrying the diaphragm is slowly moved from the edge of the disk toward the center asthe needle of said diaphragm follows the spiral grooves engraved on the disk.

Immediately the reproduction of the piece of the disk, under the pressureexerted by.

the roller 9 on the lever, against stem f a. of music is completed, the needle of the The tone arm dandthe bent lever M, iii are then forcedby means of the spring enabled to eifect the braking of the mainto the position shown by the broken lines 1 7 on the drawing, thetone arm being forced upon the curved end of the stem f. The bent levers h, 71 by pivoting around hi into the said position by the roller 9 acting bring forward the brake-pad j which bears i against the periphery of the disk bearing plate, thus causing'the latter to stop.

What I claim is Anautomatic brake for talking machines comprising a curved stem on the shank of the tone arm having a portion thereof concentric with the axis of. rotation of'the tone arm, a two armed lever fulcrumed at the junction of its arms, a brake pad mounted on the end of oneof such arms,,a roller mounted at the end of the otherarm and a spring acting uponsuch lever and causing the roller to bear agalnst the aforesaid stem such that immediately the end of the arm may be adjusted so that the mechanism may be used with machines having different sized boxes. l

Inv testimony whereof, I have signed V the presence of two subscribing witnesses.

Witnesses! V MYSSE CAMPIo 7 n, PIERRE BARRON.

HEBMANN-THORENS. 

